package org.smart4j.chapter2.util;

import org.apache.log4j.spi.LoggerFactory;
import org.slf4j.Logger;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * Created by LIJ on 2018/6/13.
 */
public class PropsUtil {

    private static final Logger LOGGER = org.slf4j.LoggerFactory.getLogger(PropsUtil.class);

    // 加载配置文件
    public static Properties loadProps(String fileName){
        Properties props = null;
        InputStream is = null;
        try {
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if(is == null){
                throw  new FileNotFoundException(fileName+"file is not found");
            }
            props = new Properties();
            props.load(is);
        } catch (IOException e) {
            LOGGER.error("load propertis file failure",e);
        } finally {
           if(is != null){
               try {
                   is.close();
               } catch (IOException e) {
                   LOGGER.error("close input stream failure",e);
               }
           }
        }
        return  props;
    }

    //获取字符型属性(默认为空字符串)
    public static String getString(Properties props,String key){
        return getString(props,key,"");
    }

    //获取字符型属性（可指定默认值）
    public static String getString(Properties props,String key,String defaultValue){
        String value = defaultValue;
        if(props.containsKey(key)){
            value = props.getProperty(key);
        }
        return value;
    }

    //获取数值型属性（默认为0）
    public static int getInt(Properties props,String key){
        return getInt(props,key,0);
    }
    //获取数值型属性（可指定默认值）
    public static int getInt(Properties props,String key,int defaultValue){
        int value = defaultValue;
        if(props.containsKey(key)){
            value =  CastUtil.castInt(props.getProperty(key));
        }
        return value;
    }

    //获取布尔型的属性（默认值false）
    public static boolean getBoolean(Properties props,String key){
        return getBoolean(props,key,false);
    }

    //获取布尔型的属性 （可指定默认值）
    public static boolean getBoolean(Properties props,String key,boolean defaultValue){
        boolean value = defaultValue;
        if(props.containsKey(key)){
            value = CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }

}
